Matrix properties
number of rows	4,101
number of columns	4,101
nonzeros	81,057
structural full rank?	yes
structural rank	4,101
# of blocks from dmperm	443
# strongly connected comp.	31
entries not in dmperm blocks	5,372
explicit zero entries	1,625
nonzero pattern symmetry	2%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	J. Mallya
editor	T. Davis
date	1994
kind	chemical process simulation problem
2D/3D problem?	no

Additional fields	size and type
b	full 4101-by-1

Ordering statistics:	AMD	METIS	DMPERM+
nnz(chol(P*(A+A'+s*I)*P'))	1,867,599	1,387,991	211,022
Cholesky flop count	2.0e+09	8.9e+08	1.9e+07
nnz(L+U), no partial pivoting	3,731,097	2,771,881	423,315
nnz(V) for QR, upper bound nnz(L) for LU	135,543	191,474	133,276
nnz(R) for QR, upper bound nnz(U) for LU	333,874	421,308	284,996

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 1625 explicit zero entries.

Maintained by Tim Davis, last updated 04-May-2008.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.